        header{
            height:60px;
            margin: auto;
            border: 1px dashed black;
            box-sizing: border-box;
            background-color: grey;
            text-align: center;
        }
        main{
            width: 70%;
            margin: 0 auto;
            position: relative;
            box-sizing: border-box;
            text-align: center;
        }
        #one_left{
            width: 50%;
            height: 500px;
            border: 1px dashed black;
            box-sizing: border-box;
            float: left;
            margin:auto;
            background-color: rgba(3, 109, 35, 0.881);/*文字*/
        }
        #one_right{
            width: 50%;
            height: 500px;
            border: 1px dashed black;
            box-sizing: border-box;
            float: right;/*图片*/
            margin:auto;
        }
        #three_right{
            width: 33.3%;
            height: 500px;
            border: 1px dashed black;
            box-sizing: border-box;
            float: right;/*图片*/
            margin:auto;
        }
        #one_right_up,#three_right_up{
            width: 100%;
            height: 250px;
            /* border: 1px dashed black; */
            float: right;
            margin:auto;
            box-sizing: border-box;
            background-color: rgba(130, 5, 5, 0.776);/*图片*/
        }
        #one_right_down{
            width: 100%;
            height: 250px;
            /*border: 1px dashed black;*/
            float: right;
            margin:auto;
            background-color: rgba(130, 5, 5, 0.5);/*图片*/
        }
        #two{
            height: 500px;
        }
        #two_left,#three_left{
            width: 33.3%;
            height: 500px;
            border: 1px dashed black;
            box-sizing: border-box;
            float: left;
            background-color: rgba(3, 109, 35, 0.881);/*文字*/
        }
        #two_right{
            width: 33.3%;
            height: 500px;
            border: 1px dashed black;
            box-sizing: border-box;
            float: right;
            background-color: rgba(3, 109, 35, 0.881);/*文字*/
        }
        #three_right_down{
            width: 100%;
            height: 250px;
            border: 1px dashed black;
            box-sizing: border-box;
            float: right;
            background-color: rgba(3, 109, 35, 0.881);/*文字*/
        }
        
        #two_middle,#three_middle{
            width: 33.3%;
            height: 500px;
            border: 1px dashed black;
            box-sizing: border-box;
            float: left;
            background-color: rgba(130, 5, 5, 0.776);/*图片*/
        }
        #four{
            width: 100%;
            height: 400px;
            border: 1px dashed black;
            box-sizing: border-box;
        }
        #four_1,#four_2{
            width: 100%;
            height: 50%;
            border: 1px dashed black;
            box-sizing: border-box;
        }
        #four_11,#four_13,#four_15,#four_22,#four_24{
            width: 20%;
            height: 100%;
            border: 1px dashed black;
            box-sizing: border-box;
            float: left;
            background-color:rgba(130, 5, 5, 0.5);/*图片*/;
        }
        #four_12,#four_14,#four_21,#four_23,#four_25{
            width: 20%;
            height: 100%;
            border: 1px dashed black; 
            box-sizing: border-box;
            float: left;
            background-color: rgba(130, 5, 5, 0.776);/*图片*/
        }
        #right_1{
            width: 60px;
            height: 400px;
            border: 1px dashed black;
            box-sizing: border-box;
            writing-mode: vertical-lr;
            background-color: rgba(0, 222, 243, 0.795);/*右下固定导航栏*/
            position: fixed; 
            right: 60px;
            bottom: 70px;
        }
        .clearfix{
            clear: both;
            top: 10px;
        }
        footer{
            height:60px;
            margin: auto;
            border: 1px dashed black;
            box-sizing: border-box;
            background-color: rgba(3, 42, 109, 0.881);
            text-align: center;
        }